CN111065821A

CN111065821A - Compressor with a compressor housing having a plurality of compressor blades

Info

Publication number: CN111065821A
Application number: CN201880053186.3A
Authority: CN
Inventors: 船越大辅; 福田昭德; 冈秀人; 渡边健司
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2017-09-04
Filing date: 2018-08-02
Publication date: 2020-04-24
Anticipated expiration: 2038-08-02
Also published as: US20200248687A1; JP7117608B2; JPWO2019044350A1; WO2019044350A1; CN111065821B; US11231034B2

Abstract

The compressor of the present invention comprises: the scroll compressor comprises a fixed scroll (6) and an orbiting scroll (7) constituting a compression mechanism part (2), a compression chamber (9) formed between the fixed scroll (6) and the orbiting scroll (7), a suction chamber (11) provided on the outer peripheral side of the fixed scroll (6), a discharge port (12) provided at the center part of the fixed scroll (6), a muffler (16) provided so as to cover the discharge port (12) at the upper part of the fixed scroll (6), and a heat insulating member (24) provided between the fixed scroll (6) and a muffler space (14) formed by the muffler (16). The refrigerant gas sucked into the suction chamber (11) is swirled by the orbiting scroll (7), moves while changing the volume of the compression chamber (9), is compressed, and is discharged from the discharge port (12). The refrigerant gas discharged from the discharge port (12) is discharged to the muffler space (14).

Description

Compressor with a compressor housing having a plurality of compressor blades

Technical Field

The present invention relates to a compressor used in a cooling device such as a cooling/heating air conditioner or a refrigerator, a heat pump type hot water supply device, or the like.

Background

Conventionally, a hermetic compressor used in a cooling device, a hot water supply device, or the like has a function of compressing a refrigerant gas returned from a refrigeration cycle in a compression mechanism and sending the compressed refrigerant gas to the refrigeration cycle. The refrigerant gas returned from the refrigeration cycle is supplied to a compression chamber formed in the compression mechanism portion via the suction passage. Then, the refrigerant gas compressed to have a high temperature and a high pressure is discharged from the compression mechanism into the closed casing, and is sent to the refrigeration cycle through a discharge pipe provided in the closed casing (see, for example, patent document 1).

Fig. 7 is a sectional view showing a compression mechanism of a conventional scroll compressor disclosed in patent document 1.

The low-temperature and low-pressure refrigerant gas is guided to the suction chamber of the fixed scroll 102 through the suction pipe 101, compressed by the change in volume of the compression chamber 103, and becomes high-temperature and high-pressure. Then, the high-temperature and high-pressure refrigerant gas is discharged through a discharge port 104 at the upper portion of the fixed scroll 102 into a muffler space 106 formed by the fixed scroll 102 and a muffler 105 covering the upper portion thereof, and is sent from the muffler space 106 into a closed container 107 and to the refrigeration cycle through a discharge pipe 108.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2007-247601

Disclosure of Invention

However, in the compressor having the configuration of fig. 7, the low-temperature refrigerant introduced into the suction chamber of the fixed scroll 102 is affected (for example, heated) by the heat of the refrigerant gas of the highest temperature and high pressure discharged from the discharge port 104 at the upper portion of the fixed scroll 102 into the muffler space 106.

As a result, the refrigerant gas expands at the time point of closing the compression chamber 103. Therefore, the circulation amount of the refrigerant gas is reduced.

Further, the refrigerant gas during compression in compression chamber 103 also passes from muffler space 106 through fixed scroll 102, and is therefore affected by the heat of the high-temperature and high-pressure refrigerant gas. Therefore, the refrigerant gas expands, and the compression loss of the refrigerant increases.

The present invention has been made to solve the above conventional problems, and an object of the present invention is to provide a high-efficiency compressor by suppressing a decrease in a refrigerant circulation amount and a decrease in a compression loss of a refrigerant.

The present invention provides a compressor, comprising: a fixed scroll and an orbiting scroll constituting a compression mechanism part; a compression chamber formed between the fixed scroll and the orbiting scroll; a suction chamber provided on the outer peripheral side of the fixed scroll; a discharge port provided at the center of the fixed scroll;

a silencer covering the discharge port on the upper part of the fixed scroll; and a heat insulating member provided between the fixed scroll and a muffler space formed by the muffler. The refrigerant gas sucked into the suction chamber is swirled by the orbiting scroll, and the compression chamber moves while changing its capacity, is compressed, and is then discharged from the discharge port. The refrigerant gas discharged from the discharge port is discharged into the muffler space.

Thus, the heat insulating member provided between the upper portion of the fixed scroll and the muffler functions as a heat insulating layer. Therefore, the heat insulating member suppresses the influence of heat from the muffler space through which the refrigerant of the highest temperature and high pressure passes to the suction chamber and the compression chamber before the start of the compression of the lowest temperature in the fixed scroll.

In addition, the heat insulating member suppresses the influence of the high-temperature refrigerant in the space in the container above the muffler space on the heat of the fixed scroll together with the muffler space. Therefore, an increase in the refrigerant temperature is suppressed, a decrease in the refrigerant circulation amount is prevented, and an increase in the compression loss of the refrigerant is suppressed. This enables a high-efficiency compressor to be realized.

Further, when preventing a decrease in the refrigerant circulation amount and suppressing an increase in the compression loss of the refrigerant, it is not necessary to change the shape of the fixed scroll or the like. Therefore, it is possible to suppress an increase in the volume of the discharge port provided in the fixed scroll and to keep the discharge dead volume to a minimum, while preventing a decrease in the refrigerant circulation amount and suppressing an increase in the compression loss of the refrigerant.

According to the present invention, it is possible to suppress an increase in the temperature of the refrigerant while keeping the discharge dead volume to a minimum, prevent a decrease in the refrigerant circulation amount, and suppress an increase in the compression loss of the refrigerant, thereby providing a high-efficiency compressor.

Drawings

Fig. 1 is a side view showing an example of a cross section of a compressor according to embodiment 1 of the present invention.

Fig. 2 is a view showing an example of a cross section of a main portion of a compressor according to embodiment 1 of the present invention.

Fig. 3 is a perspective view showing an example of a muffler, a heat insulating member, and a fixed scroll of a compressor according to embodiment 1 of the present invention.

Fig. 4 is a diagram showing an example of characteristics of a relationship between a discharge port capacity of the compressor and a circulation amount of the refrigerant according to the present invention.

Fig. 5 is a view showing an example of a main part of a compressor according to embodiment 2 of the present invention.

Fig. 6 is a perspective view showing an example of a muffler, a heat insulating member, and a fixed scroll of a compressor according to embodiment 2 of the present invention.

Fig. 7 is a side view showing an example of a cross section of a scroll compressor of a comparative example.

Detailed Description

A compressor according to claim 1 of the present invention includes: a fixed scroll and an orbiting scroll constituting a compression mechanism part; a compression chamber formed between the fixed scroll and the orbiting scroll; a suction chamber provided on the outer peripheral side of the fixed scroll; a discharge port provided at the center of the fixed scroll;

The 2 nd aspect of the present invention may be configured as follows: the heat insulating member has a recess provided between the muffler space and the suction chamber.

As a result, the refrigerant gas and the oil in the refrigerant gas enter and accumulate in the concave portion provided in the heat insulating member, and the concave portion functions as a heat insulating layer. Therefore, a high heat insulation effect can be obtained by combining the heat insulation effect by the refrigerant gas and the concave portion where the oil in the refrigerant gas is accumulated and the heat insulation effect of the heat insulation member itself. Therefore, the influence of heat of the high-temperature refrigerant in the muffler space is strongly suppressed (for example, blocked). Therefore, in the present invention, the increase in the refrigerant temperature is effectively suppressed, the decrease in the refrigerant circulation amount is prevented, and the increase in the compression loss of the refrigerant is suppressed. This enables a high-efficiency compressor to be realized.

The 3 rd aspect of the present invention may be configured as follows: the recess is also provided in a region other than between the muffler space and the suction chamber.

Thus, the heat insulating layer of the recess of the heat insulating member can further strongly suppress the influence of heat on the compression chamber of the fixed scroll from the space in the container above the muffler space where the relatively high-temperature refrigerant exists. Therefore, the decrease in the refrigerant circulation amount due to the increase in the temperature of the refrigerant is more effectively suppressed, and the increase in the compression loss of the refrigerant is suppressed. This makes it possible to provide a high-efficiency compressor.

The 4 th aspect of the present invention may be configured as follows: the vicinity of the muffler space of the heat insulating member is fixed to the fixed scroll by a bolt.

This improves the airtightness between the vicinity of the muffler space of the heat insulating member and the recess. Therefore, the heat exchange between the high-temperature and high-pressure refrigerant in the muffler space and the refrigerant in the recess is prevented from degrading the heat insulating effect of the recess. This maintains a high heat insulating effect of the recess. Therefore, the effect of preventing a decrease in the refrigerant circulation amount due to an increase in the temperature of the refrigerant and the effect of suppressing an increase in the compression loss of the refrigerant become higher. Therefore, a high-efficiency compressor can be provided.

The 5 th aspect of the present invention may be configured as follows: the heat insulating member further includes a reed valve for opening and closing the discharge port and an opening serving as a relief portion of the reed valve, and at least one of a lip portion of the opening and an opening lip portion of the recess of the heat insulating member has a convex shape protruding most toward the fixed scroll.

Thereby, the convex shape of the heat insulating member is pressed against the upper surface of the fixed scroll. Therefore, the muffler space and the recess are strongly blocked. This prevents the heat exchange between the high-temperature and high-pressure refrigerant in the muffler space and the refrigerant in the recess from degrading the heat insulating effect of the recess. Therefore, a high heat insulating effect of the recess is maintained. Therefore, the effect of preventing a decrease in the refrigerant circulation amount due to an increase in the temperature of the refrigerant and the effect of suppressing an increase in the compression loss of the refrigerant become higher. This makes it possible to provide a high-efficiency compressor.

The heat insulating member according to claim 6 of the present invention may be formed of a porous material such as sintered metal.

Thus, the heat insulating member has a low thermal conductivity. Therefore, the heat insulating effect of the heat insulating member itself is increased. This makes it possible to more strongly suppress the influence of heat from the high-temperature and high-pressure refrigerant in the muffler space and the influence of heat from the refrigerant in the space in the container above the muffler space. Therefore, the decrease in the circulation amount due to the increase in the temperature of the refrigerant is more effectively suppressed, and the increase in the compression loss of the refrigerant is suppressed. This makes it possible to provide a high-efficiency compressor.

The 7 th aspect of the present invention may be configured as follows: the heat insulating member is formed by stacking a plurality of plates.

This reduces heat conduction between the plates of the heat insulating member. Therefore, the heat insulating effect of the heat insulating member itself is increased. This makes it possible to more strongly suppress the influence of heat from the high-temperature and high-pressure refrigerant in the muffler space and the influence of heat from the refrigerant in the space in the container above the muffler space. Further, when the plate thickness of the plate facing the fixed scroll is small among the plurality of plates, the plate facing the fixed scroll is high in adhesion to the upper surface of the fixed scroll. Therefore, heat exchange between the refrigerant in the recess and the circulation of the high-temperature and high-pressure refrigerant in the muffler space is more reliably prevented. Therefore, the decrease in the circulation amount due to the increase in the temperature of the refrigerant is more effectively suppressed, and the increase in the compression loss of the refrigerant is suppressed. This makes it possible to provide a high-efficiency compressor.

The 8 th aspect of the present invention may be configured as follows: the plurality of plates includes a plate having a recess.

Thereby, the plurality of plates includes a plate having a recess. Therefore, the heat insulating member having the concave portion is formed without cutting or the like. Further, when the plate thickness of the plate facing the fixed scroll is small among the plurality of plates, the plate facing the fixed scroll is high in adhesion to the upper surface of the fixed scroll. Therefore, heat exchange between the refrigerant in the recess and the circulation of the high-temperature and high-pressure refrigerant in the muffler space is strongly prevented. Therefore, a decrease in the refrigerant circulation amount due to a temperature increase is more efficiently prevented, and an increase in the compression loss of the refrigerant is suppressed. This makes it possible to provide a high-efficiency compressor.

Embodiments of the present invention will be described below with reference to the drawings. Further, the present invention is not limited to this embodiment.

(embodiment 1)

Fig. 1 is a side view showing an example of a cross section of a compressor 50 according to embodiment 1 of the present invention. Fig. 2 is a view showing an example of a cross section of a main portion of a compressor 50 according to embodiment 1 of the present invention. Fig. 3 is a perspective view showing an example of the muffler 16, the heat insulating member 24, and the fixed scroll 6 of the compressor 50 according to embodiment 1 of the present invention. Fig. 3 (a) is a perspective view of the muffler 16 of the compressor 50 as viewed from below. Fig. 3 (b) is a perspective view of the heat insulating member 24 of the compressor 50 as viewed from below. Fig. 3 (c) is a perspective view of the fixed scroll 6 of the compressor 50 as viewed from below.

As shown in fig. 1, the compressor 50 of the present embodiment includes: a closed casing 1, a compression mechanism section 2 provided inside the closed casing 1, and a motor section 3 provided inside the closed casing 1.

The main bearing member 4 is fixed in the hermetic container 1 by welding, shrink fitting, or the like. The shaft 5 is supported by the main bearing member 4.

The fixed scroll 6 is fixed to the main bearing member 4 by bolts. An orbiting scroll 7 meshing with the fixed scroll 6 is sandwiched between the fixed scroll 6 and the main bearing member 4, and constitutes a scroll-type compression mechanism portion 2.

A rotation restricting mechanism 8 including an oldham ring or the like is provided between the orbiting scroll 7 and the main bearing member 4, and the rotation restricting mechanism 8 guides the orbiting scroll 7 to perform a circular orbit motion so as to prevent the rotation of the orbiting scroll.

The rotation restricting mechanism 8 eccentrically drives the orbiting scroll 7 via an eccentric shaft portion 5a located at the upper end of the shaft 5, thereby causing the orbiting scroll 7 to orbit circularly. Thereby, the compression chamber 9 formed between the fixed scroll 6 and the orbiting scroll 7 moves from the outer peripheral side toward the center while contracting the volume of the compression chamber 9. By this operation, refrigerant gas is sucked from a suction pipe 10 communicating with the refrigeration cycle outside the sealed container 1 through a suction chamber 11, which is provided in the fixed scroll between the suction pipe 10 and the compression chamber 9 and is always at a suction pressure. The sucked refrigerant gas is sealed in the compression chamber 9 and then compressed. The refrigerant gas having reached a predetermined pressure is discharged from a discharge port 12 at the center of the fixed scroll 6 by pushing open a reed valve 13.

The refrigerant gas discharged by pushing open the reed valve 13 is discharged into the muffler space 14, passes through the container space 15 of the sealed container 1, and is sent out to the refrigeration cycle from the discharge pipe 17. The muffler space 14 is formed by a muffler 16 fixed to the fixed scroll 6 around the circumference thereof, and covers the discharge port 12 and the reed valve 13.

On the other hand, a pump 18 is provided at the lower end of the shaft 5 for driving the orbiting scroll 7 to orbit. The suction port of the pump 18 is disposed so as to be present in the oil reservoir 19. The pump 18 operates simultaneously with the scroll compressor. Therefore, the pump 18 reliably sucks up the oil in the oil reservoir 19 provided at the bottom of the closed casing 1 regardless of the pressure condition and the operating speed.

The oil pumped up by the pump 18 is supplied to the compression mechanism section 2 through an oil supply hole 20 in the through shaft 5. Further, foreign matter can be removed from the oil by an oil strainer or the like before or after the oil is sucked up by the pump 18, thereby preventing the foreign matter from being mixed into the compression mechanism section 2. Therefore, the reliability of the compression mechanism section 2 can be improved.

The pressure of the oil introduced into the compression mechanism section 2 is substantially equal to the discharge pressure of the scroll compressor. Further, the pressure of the oil introduced into the compression mechanism portion 2 also becomes a back pressure source for the orbiting scroll 7. Thus, the orbiting scroll 7 stably performs a predetermined compression function without separating from or contacting the fixed scroll 6. Further, a part of the oil seeks a discharge place due to the supply pressure and its own weight, enters a fitting portion between the eccentric shaft portion 5a and the orbiting scroll 7, and a bearing portion 21 between the shaft 5 and the main bearing member 4, lubricates the respective portions, and then drops and returns to the oil reservoir 19.

The other part of the oil supplied from the oil supply hole 20 to the high-pressure region 22 passes through a path 7a formed in the orbiting scroll 7 and having one open end in the high-pressure region 22, and enters a back-pressure chamber 23 in which the rotation limiting mechanism 8 is located. The entering oil acts to lubricate the thrust sliding portion and the sliding portion of the rotation restricting mechanism 8, and also acts to apply back pressure to the orbiting scroll 7 in the back pressure chamber 23.

As described above, the refrigerant gas compressed by the compression mechanism 2 is sucked into and compressed in the compression chamber 9 between the fixed scroll 6 and the orbiting scroll 7 through the suction chamber 11 provided in the fixed scroll 6. However, the refrigerant gas compressed by the compression mechanism 2 is affected by the heat of the refrigerant gas of the highest temperature and high pressure discharged from the discharge port 12 of the fixed scroll 6 to the muffler space 14.

Therefore, in the present invention, the plate-like heat insulating member 24 is provided between the fixed scroll 6 and the muffler 16 forming the muffler space 14, and a part of the heat insulating member 24 is positioned between the muffler space 14 and the suction chamber 11.

The heat insulating member 24 has a reed valve 13 for opening and closing the discharge port of the fixed scroll 6. Further, an opening 25 that allows the reed valve 13 to be positioned at this position, that is, a relief portion of the reed valve 13 is provided in a part of the heat insulating member 24. The other part of the heat insulating member 24 is located between the area of the muffler space 14 other than the reed valve 13 and the fixed scroll 6. The heat insulating member 24 is fastened and fixed to the fixed scroll 6 together with the muffler 16 by inserting bolts (not shown) through holes 26 provided in the outer peripheral portion.

Thus, the portion of the heat insulating member 24 other than the opening 25 is positioned between the suction chamber 11 and the compression chamber 9 of the fixed scroll 6 and the muffler space 14. Therefore, the portion of the heat insulating member 24 other than the opening 25 functions as a heat insulating layer, and the influence of the high-temperature and high-pressure refrigerant in the muffler space 14 on the heat of the suction chamber 11 and the compression chamber 9 is suppressed. That is, a decrease in the circulation amount and an increase in the compression loss of the refrigerant, which are associated with an increase in the temperature of the refrigerant in the suction chamber 11 and the compression chamber 9, are suppressed. This enables a high-efficiency compressor to be realized.

The portion other than the opening 25 of the heat insulating member 24 is also located between the container space 15 of the closed casing 1 and the fixed scroll 6. Thus, the portion of the insulating member 24 other than the opening 25 suppresses, together with the muffler space 14, the influence of the high-temperature refrigerant in the container space 15 above the muffler space on the heat of the fixed scroll 6. Therefore, the temperature of the fixed scroll 6 itself is maintained lower than that when the heat insulating member 24 is not provided. From this point of view, a decrease in the refrigerant circulation amount is prevented, and an increase in the compression loss of the refrigerant is suppressed. This enables a high-efficiency compressor to be realized.

Further, according to the configuration of the present embodiment, when preventing a decrease in the refrigerant circulation amount and suppressing an increase in the compression loss of the refrigerant, it is not necessary to change the shape of the fixed scroll 6 or the like. Therefore, an increase in the volume of the discharge port 12 provided in the fixed scroll 6 is suppressed. That is, according to the configuration of the present embodiment, it is possible to prevent a decrease in the refrigerant circulation amount and suppress an increase in the compression loss of the refrigerant while keeping the discharge dead volume to the minimum as it is, as compared with the case where the heat insulating member 24 is not provided.

In the present embodiment, the heat insulating member 24 is formed of a sintered metal, for example. Therefore, the rise in the refrigerant temperature is effectively suppressed. The sintered metal has low thermal conductivity and has a large amount of minute spaces. Since the sintered metal has high heat insulating properties, the heat insulating member 24 made of the sintered metal can efficiently suppress the influence of heat from the high-temperature refrigerant in the muffler space 14 and the container space 15. When the heat insulating member 24 is formed of sintered metal, the heat insulating effect of the heat insulating member 24 is enhanced. Therefore, the increase in the refrigerant temperature is more efficiently suppressed, the decrease in the refrigerant circulation amount is prevented, and the increase in the compression loss of the refrigerant is suppressed. This enables a high-efficiency compressor to be realized.

The material of the heat insulating member 24 is not limited to a porous material such as a sintered metal. For example, a material such as a resin material may be used as long as the material has low thermal conductivity.

The heat insulating member 24 may be a single sheet, or may be formed by stacking a plurality of sheets. The laminated heat insulating member 24 formed by laminating a plurality of plates strongly suppresses (or blocks, as the case may be) heat conduction between the plates. Therefore, the heat insulating effect is improved, and it is effective.

In the present embodiment, a member having a predetermined shape is used as the heat insulating member 24. However, the heat insulating member 24 may be formed between the fixed scroll 6 and the muffler space 14 by injection molding, for example.

(embodiment 2)

Fig. 5 is a diagram showing an example of a main part of a compressor 50 according to embodiment 2 of the present invention. Fig. 5 (a) is a sectional view, and fig. 5 (b) is a detailed view showing an example of the structures of the heat insulating member 24 and the fixed scroll 6. Fig. 6 is a perspective view showing an example of the muffler 16, the heat insulating member 24, and the fixed scroll 6 of the compressor 50 according to embodiment 2 of the present invention. Fig. 6 (a) is a perspective view of the muffler 16 of the compressor 50 as viewed from below. Fig. 6 (b) is a perspective view of the heat insulating member 24 of the compressor 50 as viewed from below. Fig. 6 (c) is a perspective view of the fixed scroll 6 of the compressor 50 as viewed from below. Fig. 6 (d) is a perspective view of the muffler 16 of the compressor 50 as viewed from the heat insulating member 24 side. Fig. 6 (e) is a perspective view of the heat insulating member 24 of the compressor 50 as viewed from above. Fig. 6 (f) is a perspective view of the fixed scroll 6 of the compressor 50 as viewed from above.

In embodiment 2, a recess 27 is provided in the heat insulating member 24 of the compressor 50 on the surface facing the fixed scroll 6. The recess 27 is formed as wide as possible so as to be positioned outside the region overlapping the muffler space 14, in addition to the region overlapping the muffler space 14. Therefore, the recess 27 has a shape along the edge of the opening 25.

In the heat insulating member 24, a through hole 24a is formed in a portion facing the container space 15 through the notch portion 16a of the muffler 16 (see fig. 6). When the heat insulating member 24 is viewed from the side, the lip portion of the opening 25 is a highest convex shape 28 (see fig. 5) when viewed from the side of the surface facing the fixed scroll 6. Therefore, when the outer peripheral portion of the insulating member 24 is fastened and fixed to the fixed scroll 6 together with the muffler 16, the portion of the convex shape 28 of the insulating member 24 is strongly pressed against the upper surface portion of the fixed scroll 6. This strongly blocks the space between the muffler space 14 and the recess 27.

Other basic structures are the same as those of embodiment 1. Therefore, the same components as those in embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

In the compressor configured as described above, the high-temperature and high-pressure refrigerant discharged into the container space 15 and the oil in the refrigerant enter the recess 27 of the heat insulating member 24 through the through hole 24a and are accumulated. Thereby, the recess 27 is in a state of a temperature lower than the highest temperature and high pressure refrigerant in the muffler space 14. Therefore, the refrigerant and the oil in the recess 27 are accumulated to function as a heat insulating layer. Thus, a high heat insulation effect can be obtained by combining the heat insulation effect of the heat insulating member 24 and the heat insulation effect of the concave portion 27. That is, the influence of the heat of suction chamber 11 and compression chamber 9 from muffler space 14 is greatly reduced by the stagnation of the refrigerant and oil in recess 27. Therefore, a strong heat insulating effect can be obtained by combining the effect of suppressing the heat insulating member 24 and the effect of suppressing the recess 27.

Therefore, the influence of heat of the high-temperature refrigerant in the muffler space 14 is strongly suppressed, the decrease in the circulation amount due to the temperature increase of the refrigerant is more effectively prevented, and the increase in the compression loss of the refrigerant is suppressed. This makes it possible to provide a high-efficiency compressor.

Here, as a structure for suppressing the influence of heat from the muffler space 14 to the suction chamber 11 and the like, for example, the following structure is considered: a recess similar to the recess 27 of the present embodiment is provided on the surface of the fixed scroll 6 facing the fixed scroll, and the recess provided in the fixed scroll is closed with a closing plate or the like. By configuring such that oil is accumulated in the recess provided in the fixed scroll, the recess provided in the fixed scroll exerts a heat insulating effect, and prevents an influence on heat of the suction chamber 11 and the like.

However, in the case of this structure, the plate thickness of the fixed scroll 6 becomes thicker than the region where the recess is provided. As a result, the volume (dead volume) of the discharge port 12 formed in the fixed scroll 6 increases. Therefore, the refrigerant compressed in the compression chamber 9 expands at the stage of being discharged to the discharge port 12. This cancels out the effect of suppressing the decrease in the circulation amount of the refrigerant due to the heat insulation of the recess provided in the fixed scroll.

However, according to the configuration of the present embodiment, the recess 27 is provided not in the fixed scroll 6 but in the heat insulating member 24. Therefore, the shape of the fixed scroll 6 does not need to be changed. This prevents problems such as an increase in the volume of the discharge port 12. That is, the discharge dead volume is kept to a minimum, and the circulation amount of the refrigerant is reliably increased. Therefore, a high-efficiency compressor can be realized.

Fig. 4 is a diagram showing an example of characteristics of a relationship between the volume of the discharge port of the compressor 50 and the circulation amount of the refrigerant. In fig. 4, X represents a characteristic curve in the case where the heat insulating structure is not employed, and Y represents a characteristic curve in the case where the heat insulating structure is employed.

As is clear from fig. 4, the characteristic curve is Y in the case of the heat insulating structure, and the circulation amounts of the refrigerant at the discharge port volumes S1, S2, and S3 are increased to the positions of the characteristic curve Y in comparison with the characteristic curve X in the case of the heat insulating structure.

When the thermal insulation structure formed by increasing the plate thickness of the fixed scroll 6 is employed, the discharge port volume is increased to S1 to S3 when the discharge port volume before the thermal insulation structure is employed is set to S1. When the discharge port volume is S3, the circulation amount of the refrigerant increases from T1 of the characteristic curve X in the case where the heat insulating structure is not employed to T2 of the characteristic curve Y in the case where the heat insulating structure is employed. However, if T2, which is the circulation amount of the refrigerant in the characteristic curve of Y, is compared with T3, which is the circulation amount of the refrigerant when the discharge port volume is S1 in the case where the heat insulation structure is not employed, the circulation amount of the refrigerant is slightly increased, but is offset by the increase in the discharge port volume (increase in the discharge dead volume), and is hardly increased.

However, in the case of the heat insulating structure provided with the heat insulating member as described in the present embodiment, the discharge port volume S1 is not increased. That is, the discharge dead volume can be kept to a minimum as it is, compared with the case where the heat insulating member 24 is not provided. Therefore, in the case of the heat insulating structure, the circulation amount of the refrigerant in the discharge port volume S1 becomes T4 of the characteristic curve of Y. Therefore, the circulation amount of the refrigerant is greatly increased from T3 of the characteristic curve X.

In this way, in the case of adopting the heat insulating structure provided with the heat insulating member as described in the present embodiment, the circulation amount of the refrigerant is reliably increased, and a high-efficiency compressor can be realized.

In the present embodiment, the highest convex shape 28 is formed at the edge of the opening 25 of the heat insulating member 24 in the concave portion 27. The convex 28 portion is strongly pressed against the upper surface portion of the fixed scroll 6. Therefore, the muffler space 14 is strongly blocked from the recess 27. Therefore, the heat insulating effect between the refrigerant and the oil in the concave portion 27 is prevented from being reduced due to the circulation of the high-temperature and high-pressure refrigerant in the muffler space 14 and the refrigerant in the concave portion 27. This improves the heat insulating effect of the recess 27. As a result, the influence of heat generated by the high-temperature refrigerant in the muffler space 14 is strongly suppressed. Therefore, a decrease in the circulation amount due to an increase in the temperature of the refrigerant is more effectively prevented, and an increase in the compression loss of the refrigerant is suppressed. This enables a high-efficiency compressor to be realized.

The convex shape 28 may be an opening edge portion of the recess 27 instead of the opening edge portion of the opening 25 of the heat insulating member 24 of the recess 27, for example. That is, at least one of the opening edge portion of the opening 25 of the heat insulating member 24 of the recess 27 and the opening edge portion of the recess 27 may be formed in the convex shape 28. Further, the prevention of heat exchange between the refrigerant in the recess 27 and the high-temperature and high-pressure refrigerant in the muffler space 14 by the circulation can be achieved by the structure in which the lip portion of the opening 25 provided in the heat insulating member 24 is fixed to the fixed scroll 6 by a bolt even if the surface of the heat insulating member 24 on the side facing the fixed scroll 6 is flat. Further, by coupling the protruding portion 28 and the opening edge portion where the bolt fixing position is the opening 25, the effect of preventing heat exchange between the refrigerant in the concave portion 27 and the high-temperature and high-pressure refrigerant in the muffler space 14 from circulating can be further improved.

As described in the embodiment, the heat insulating member 24 is formed by stacking a plurality of plates, so that the heat insulating effect is enhanced as described above, and the influence of heat from the muffler space 14 to the fixed scroll 6 is more effectively suppressed.

Further, when the plate thickness of the plate facing the fixed scroll 6 is small, for example, as thin as about 1mm, among the plurality of plates constituting the heat insulating member 24, the plate facing the fixed scroll 6 is improved in adhesion to the upper surface of the fixed scroll 6. This more reliably prevents the refrigerant in the recess 27 and the high-temperature and high-pressure refrigerant in the muffler space 14 from circulating. Therefore, the heat insulating effect of the concave portion 27 is more effectively exhibited.

Further, the heat insulating member 24 is configured by stacking a plate provided with the concave portion 27 and a plate having no concave portion, and the concave portion 27 is formed without performing cutting work. Therefore, the heat insulating member 24 is provided at low cost. Further, by alternately stacking a plurality of plates provided with the recesses 27 and plates without recesses, a plurality of recesses 27 are formed in the stacking direction. Thereby, the heat insulating effect of the concave portion 27 becomes higher.

Further, by forming the heat insulating layer in the heat insulating member 24 and the muffler 16 itself, the influence of heat from the muffler space 14 and the container space 15 to the suction chamber 11 and the compression chamber 9 is further suppressed. Examples of the heat insulating layer include resin coating, coating treatment of hollow beads having a vacuum inside or containing air, and the like, but are not limited thereto.

As described above, according to the present invention, as described above with reference to the respective embodiments, it is possible to realize a high-efficiency compressor by suppressing an increase in refrigerant temperature, preventing a decrease in refrigerant circulation amount, and suppressing an increase in compression loss of refrigerant. However, the present invention is not limited to the shape of the embodiment. That is, the embodiments disclosed in the specification are illustrative in all respects and should not be construed as limiting the invention. That is, the scope of the present invention is defined by the claims, not limited by the above description, and should be construed to include all modifications within the meaning and scope equivalent to the claims.

Industrial applicability of the invention

As described above, the present invention can minimize the dead volume of refrigerant discharged, suppress the increase in temperature of the refrigerant, prevent the decrease in the refrigerant circulation amount, and suppress the increase in the compression loss of the refrigerant, thereby realizing a high-efficiency compressor. Therefore, the present invention can be widely used for various devices using a refrigeration cycle.

Description of the reference numerals

1. 107 closed container

2 compression mechanism part

3 Motor part

4 main bearing component

5 shaft

5a eccentric shaft part

6. 102 fixed scroll

7 orbiting scroll

7a path

8 autorotation limiting mechanism

9. 103 compression chamber

10. 101 suction pipe

11 suction chamber

12. 104 discharge port

13 reed valve

14. 106 silencer space

15 space in the container

16. 105 silencer

16a cut part

17. 108 discharge pipe

18 pump

19 oil reservoir

20 oil supply hole

21 bearing part

22 high pressure region

23 backpressure chamber

24 Heat insulating Member

24a through hole

25 opening

26 holes

27 recess

28 convex shape

50 compressor.

Claims

1. A compressor, comprising:

a fixed scroll and an orbiting scroll constituting a compression mechanism part;

a compression chamber formed between the fixed scroll and the orbiting scroll;

a suction chamber provided on an outer peripheral side of the fixed scroll;

a discharge port provided at a central portion of the fixed scroll;

a muffler provided so as to cover the discharge port at the upper portion of the fixed scroll; and

a heat insulating member provided between the fixed scroll and a muffler space formed by the muffler,

the refrigerant gas sucked into the suction chamber is compressed by the orbiting scroll orbiting and the compression chamber moving while changing its capacity, and then discharged from the discharge port,

the refrigerant gas discharged from the discharge port is discharged to the muffler space.

2. The compressor as set forth in claim 1, wherein:

the heat insulating member has a recess provided between the muffler space and the suction chamber.

3. A compressor as set forth in claim 2, wherein:

the recess is also provided in a region other than between the muffler space and the suction chamber.

4. A compressor as claimed in claim 2 or 3, wherein:

the heat insulating member is fixed to the fixed scroll by a bolt in the vicinity of the muffler space.

5. A compressor according to any one of claims 2 to 4, wherein:

the heat insulating member further includes a reed valve for opening and closing the discharge port and an opening serving as a relief portion of the reed valve,

at least one of a mouth edge portion of the opening and an opening edge portion of the recess of the heat insulating member has a convex shape protruding most toward the fixed scroll.

6. A compressor according to any one of claims 1 to 5, wherein:

the heat insulating member is formed of a porous material such as sintered metal.

7. A compressor according to any one of claims 1 to 6, wherein:

the heat insulating member is formed by stacking a plurality of plates.

8. The compressor as set forth in claim 7, wherein:

the plurality of plates includes a plate having the recess.